2. A particle P is left fall vertically from a height to the ground. Another particle Q is projected vertically down 3s later with a velocity of 3m/s from the height. If both particles reached the ground simultaneously, calculate (a) time by each particle to reach the ground (b) distance travelled by each particle to the ground

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

J. j. thomson’s experiment disproved the theory that an atom

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?